OM-2245 / Operation and Maintenance Manual
ITW GSE 4400 / 400 Hz. Generator Set
March 15, 2015
Chapter 1-1
Page 16
9.0
Power Module Assembly
The power module assembly, mounted to the back of the ARU bracket, is located at the rear of the
machine over the generator. The panel assembly provides a means of connecting and disconnecting the
generator output to and from the aircraft.
a)
Load contactor (K1 and K2)
Each load contactor contains a magnetic operating coil and four sets of contacts. The three larger
contacts conduct three-phase AC generator output. A small contact set is connected to the Digital
Control PC Board (CTL) to activate the protective monitor circuit. Three-phase, 400-Hz generator
output power is distributed to the load contactor by 2/0 cables that pass through current transformers
.
b)
Current transformers (CT1-CT3)
A set of current transformers are used to monitor and control the line-drop compensation, ammeter,
and overload circuit.
(1) Line-Drop Compensation
The current transformers detect the magnitude and power factor of current flowing from generator
to load. They feed a signal to the voltage regulator that interprets the signal and alters the exciter
field current as required to maintain a constant predetermined voltage at the load. These values
are accessible on the color display.
(2) Ammeter
The current transformers convert a current signal to a voltage signal, which is sent to the interface
board and read by the processor boards. This signal is digitized and sent to the display board
where it is able to be read by the user on the color display in phase to phase or phase to N
format.
(3) Overload
The digitized signal is also processed to determine if the generator output is within the defined
specifications. If the current is within the following values, then the output contactor(s) are opened
at the prescribed time.
Continuous 100% rated load at PF 0.7 - 0.8
Continuous 80% rated load at PF 0.8 - 1.0
5 minutes 100% rated load at PF 0.8 - 1.0
10 seconds 120% rated load at PF 0.7 - 0.8
2 seconds 150% rated load at PF 0.7 - 0.8
Содержание 4400
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